diff --git a/tools/putenv/env b/tools/putenv/env
new file mode 100644
index 0000000..d3123e4
--- /dev/null
+++ b/tools/putenv/env
@@ -0,0 +1,5 @@
+name=value
+name2="value 2"
+#name3=value3
+name4 = value4
+name5 = "value 5"
\ No newline at end of file
diff --git a/tools/putenv/putenv.php b/tools/putenv/putenv.php
new file mode 100644
index 0000000..ae9698c
--- /dev/null
+++ b/tools/putenv/putenv.php
@@ -0,0 +1,80 @@
+<?php
+
+namespace Tools;
+
+class PutEnv {
+    private string $file;
+    private string $key;
+    private string $value;
+    private array $content;
+    public function __construct() {
+        $argv = $_SERVER['argv'];
+        $argc = sizeof($argv);
+        switch($argc) {
+            case 4:
+                $this->file = $argv[1];
+                $this->key = $argv[2];
+                $this->value = $argv[3];
+            break;
+            
+            case 3:
+                $this->file = $argv[1];
+                $this->key = $argv[2];
+                $this->value = fgets(STDIN);
+            break;
+            
+            default:
+                echo "usage:
+                    php8.0 putenv.php filename key value
+                    echo value | php8.0 putenv filename key";
+                throw new Exception("invalid params");
+        }
+        if (!file_exists($this->file)) {
+            throw new Exception('File not found');
+        }
+        $changed = 0;
+        $lineWasEmpty = false;
+        $key = $this->key;
+        $value = $this->value;
+        if (strpos($value, ' ') !== false) {
+            $value = '"' . addslashes($value) . '"';
+        }
+        $this->content = file($this->file);
+        foreach ($this->content as $l => $line) {
+            if (strlen(trim($line)) < 1) {
+                if ($lineWasEmpty) {
+                    $this->content[$l] = null;
+                } else {
+                    $lineWasEmpty = true;
+                }
+                continue;
+            }
+            $lineWasEmpty = false;
+            if (!str_starts_with($line, $this->key)) {
+                continue;
+            }
+            $next = trim(substr($line, strlen($this->key)));
+            if (strlen($next) === 0 || $next[0] !== '=') {
+                continue;
+            }
+            $this->content[$l] = $key . '=' . $value;
+            $changed++;
+        }
+        if ($changed === 0) {
+            $this->content[] = $key . '=' . $value;
+        } else if ($changed > 1) {
+            echo "Key $key changed $changed times\n";
+        }
+        $content = $this->content;
+        $this->content = [];
+        foreach ($content as $line) {
+            if ($line !== null) {
+                $this->content[] = $line;
+            }
+        }
+        $content = implode('', $this->content);
+        file_put_contents($this->file, $content);
+    }
+}
+
+new PutEnv();